Long ago I helped a friend assemble a Stutz bearcat model his dad sent to him from Italy.
Most of the chassi was of cast metal much of it brass, it was motorized and in those days before Radio control it had a control box with a long thin cable.
The steering gear worked and the engine parts moved as they would with the engine running.
It had a reverse and may have had more than one forwards gear.
I don't remember much detail, but I think this had the exposed rocker arms, the type a driver had to lube by had every so often.
The headlights even worked.
The model was pretty big, maybe a foot and a half or longer.